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How to Permanently De-activate the Start Stop Function
Guys, I find this start stop function annoying and its its draining my battery. Every time the car turns off I have to re-open my Armytrix Exhaust Valves to listen to the beauty 😂 I am not sure it is saving any fuel at all. Ok they say it help reduce emissions to save the environment. Fair enough, when I am stuck in a huge traffic jam I can always turn the car off myself. But everytime I stop on a traffic light the car goes off.😠 So i disable it. Worse, if I change mode it goes automaticly ON again by itself 😅 so I have to turn it off again. Its only when the car is on S+ this function automatically goes off. You can turn it off on I* as well. So in E, C, and S i have to keep on disabling it manually.
Any help in permanently disabling this function would be appreciated.
It can't be coded out. You have to get a tune or use an aftermarket module that turns it off every time. Mid City Engineering makes one, see the link below. I'm also not a fan of the feature, but thankfully in my AMG it's only on in C, and once turned off, it stays off as long as the car is running even when changing modes. It only comes back on the next time the car is started, and it has become part of my routine when starting up the car to press the exhaust button to open the exhaust followed by turning off ECO stop/start. In the AMGs the ECO stop/start button is also right next to the exhaust button. I think somebody at AMG anticipated that those are the first two buttons anyone with an AMG will press after starting the car . Real world testing has shown that in the right situations this feature can save 4-8% of fuel, and but compared to idling it only saves fuel after 7 seconds. So if the car is stopped for more than 7 seconds, then the feature starts to save fuel vs letting the engine idle. In the real world I just find it often turns off the engine, but I'm only stopped for a couple of seconds and then it has to restart it again. I'm just not convinced that this is w/o consequences for the engine long term, especially on the high performance AMG engines. Unfortunately, due to regulations if manufacturers want to use it to claim higher fuel efficiency they have to force it to be active when the car starts, so they are not allowed to offer a feature to turn it off permanently, otherwise the car has to be certified with the feature off. IMO the feature is mostly for the car manufacturers to cheat their way to higher unrealistic mpg figures, because the test cycles that are used have a lot of idle time and having the feature is of great advantage during the testing cycles. A lot of this stuff is a total shell game.
Thank you for your information. You have well justified why they are forcing this function specially on non-AMG cars. I dont live in the USA I am not sure to ship it all the way here. I am not a good DIY guy. I prefer the seller installing this module for me. I didnt see any information on their website regarding this module and how to install it. I thought there is a fuse somewhere or a cable i can just unplug it lol it looks more difficult than I thought. I am thinking to glue this eco button down so it remains off 🤔
See what I found. It looks pretty easy to me and saves a lot of money. I will try it hopefully it wont damage ot turn off any other system 🤷
Yes, this is something that has been going around, but I tend to not wanna disconnect something based only on the claim from somebody on the Internet that it doesn't affect anything else. I believe what this disconnection does is making it impossible for the ECO stop/start to read the current battery charge and to avoid issues it basically stops turning off the engine. As far as I know it still logs a fault code. It's not a clean solution in my mind.
Yes, this is something that has been going around, but I tend to not wanna disconnect something based only on the claim from somebody on the Internet that it doesn't affect anything else. I believe what this disconnection does is making it impossible for the ECO stop/start to read the current battery charge and to avoid issues it basically stops turning off the engine. As far as I know it still logs a fault code. It's not a clean solution in my mind.
Yes I agree, I really dont want to create damage as fixing this car is expensive. I might end up with other issues.
I have this disconnected since past summer. One side effect I see on my c43 is the idle on comfort/eco/sport is at 600 rpm. Before, if I can remember that long, used to be right on 500 rpm. Sport+ idle seems to be same around 800rpm.
Other then that, battery charge been holding good on short trip around 12.6v
On my W204 I removed the 7.5A fuse next to and for the auxiliary battery , over a month now.
It's free , no SS and HOLD is not disabled , win , win.
When you say for the auxiliary battery, removing this fuse will also disable the auxiliary battery,? I wonder where is this fuse on w205. I hope its not next to the auxiliary battery as getting to it is a nightmare. I will start digging to find this fuse. That is what i was hoping a free and easy solution.
I made a search on ebay i did not find it. Do you still have the link for this obd.
here is the link of the seller, but the post is for the AMG cluster enable.... you can search his store to find out the one you need. I did this obd as well and I can see my engine oil and trans temp every startup.
here is the link of the seller, but the post is for the AMG cluster enable.... you can search his store to find out the one you need. I did this obd as well and I can see my engine oil and trans temp every startup.
I am worried to end up with systems failure or going down due to disconnecting cables or wires from the main battery.
down to personal preference.... i didn't know about the wire connector during the time I did the AMG menu and also coded the start/stop disable.
had a friend who did the wire bypass for a long time, haven't heard any bad issues with his.
given my preference, I'd still prefer the coding somehow (cause I already spent on it. LOL)
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. Real world testing has shown that in the right situations this feature can save 4-8% of fuel, and but compared to idling it only saves fuel after 7 seconds. So if the car is stopped for more than 7 seconds, then the feature starts to save fuel vs letting the engine idle. In the real world I just find it often turns off the engine, but I'm only stopped for a couple of seconds and then it has to restart it again. I'm just not convinced that this is w/o consequences for the engine long term, especially on the high performance AMG engines. Unfortunately, due to regulations if manufacturers want to use it to claim higher fuel efficiency they have to force it to be active when the car starts, so they are not allowed to offer a feature to turn it off permanently, otherwise the car has to be certified with the feature off. IMO the feature is mostly for the car manufacturers to cheat their way to higher unrealistic mpg figures, because the test cycles that are used have a lot of idle time and having the feature is of great advantage during the testing cycles. A lot of this stuff is a total shell game.
